<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    .container {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      width: 300px;
    }
    .block {
      width: 100px;
      height: 100px;
      margin: 20px;
      flex-shrink: 0;
      transform-origin: 50% 50%;
    }
    .block:nth-child(1) {background: red;}
    .block:nth-child(2) {background: blue;}
    .block:nth-child(3) {background: green;}
    .block:nth-child(4) {background: orange;}
  </style>
</head>
<body>
  <div class="container">
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
    <div class="block"></div>
  </div>
  <script type="module">
    import {Animator} from '../common/lib/animator/index.js';
    const blocks = document.querySelectorAll('.block');
    const animator = new Animator({duration: 1000, iterations: 1.5});
    (async function () {
      let i = 0;
      while(true) { // eslint-disable-next-line no-await-in-loop
        await animator.animate(blocks[i++ % 4], ({target, timing}) => {
          target.style.transform = `rotate(${timing.p * 360}deg)`;
        });
      }
    }());
  </script>
</body>
</html>